EP0333140A1 - Dispositif d'alimentation automatique de documents - Google Patents

Dispositif d'alimentation automatique de documents Download PDF

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Publication number
EP0333140A1
EP0333140A1 EP89104530A EP89104530A EP0333140A1 EP 0333140 A1 EP0333140 A1 EP 0333140A1 EP 89104530 A EP89104530 A EP 89104530A EP 89104530 A EP89104530 A EP 89104530A EP 0333140 A1 EP0333140 A1 EP 0333140A1
Authority
EP
European Patent Office
Prior art keywords
document
conveyor roller
transparent plate
opening
roller means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89104530A
Other languages
German (de)
English (en)
Other versions
EP0333140B1 (fr
Inventor
Jun Miyoshi
Hiroyuki Nagai
Mitsugu Shibanaka
Nobukazu Maeda Mansion Otsuka
Yasuhiko Kida
Haruo Yamamoto
Toshikazu Matsui
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Mita Industrial Co Ltd
Original Assignee
Mita Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP6133388A external-priority patent/JPH0729703B2/ja
Priority claimed from JP63174135A external-priority patent/JPH0755742B2/ja
Application filed by Mita Industrial Co Ltd filed Critical Mita Industrial Co Ltd
Publication of EP0333140A1 publication Critical patent/EP0333140A1/fr
Application granted granted Critical
Publication of EP0333140B1 publication Critical patent/EP0333140B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/60—Apparatus which relate to the handling of originals
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00172—Apparatus for electrophotographic processes relative to the original handling
    • G03G2215/00177—Apparatus for electrophotographic processes relative to the original handling for scanning
    • G03G2215/00181—Apparatus for electrophotographic processes relative to the original handling for scanning concerning the original's state of motion
    • G03G2215/00185—Apparatus for electrophotographic processes relative to the original handling for scanning concerning the original's state of motion original at rest

Definitions

  • This invention relates to an automatic document conveying device for use with an image processing machine such as an electrostatic copying machine, and to various elements used in it.
  • the above automatic conveying device includes an opening-closing frame and a document table.
  • a transparent plate on which to place a document to be copied is disposed on the upper surface of the housing of the image processing machine.
  • the opening-closing frame is mounted on the housing so as to be free to pivot between a closing position at which it covers the transparent plate and an opening position at which it exposes the transparent plate to view around a pivot axis extending along one edge of the transparent plate as a center.
  • the document table is mounted on the housing adjacent to the opening-closing frame.
  • a document delivery means for delivering a plurality of sheet-like documents on the table one by one is annexed to the document table.
  • a document conveying means is annexed to the opening-closing frame to convey the document delivered from the document table to a required position on the transparent plate, and after scanning of the document, transfer it to the upper surface of the opening-closing frame.
  • the document conveying means comprises a conveyor belt mechanism extending along the transparent plate.
  • the opening-closing frame of the automatic document conveying device is held at the closing position and sheet-like documents are placed in a stacked state on the document table. Then, the operation of the automatic document conveying device is started.
  • One document is then delivered from the document table by the document delivery means, and conveyed to a required position on the transparent plate by the document conveying means. When the scanning of the conveyed document is over, the document is transferred to the upper surface of the opening-closing frame from the transparent plate by the document conveying means. The next document is then delivered from the document table by the document delivery means.
  • the aforesaid conventional automatic document conveying device is relatively complex and expensive owing to the structure of the document conveying means including the conveyor belt mechanism. Accordingly, it is unsuitable for a relatively inexpensive low- to medium-grade image processing machines.
  • Another object of this invention is to improve an atuomatic document conveying device including a document conveying means of a simplified structure annexed to the opening-closing frame, in various respects in the structures of the constituent elements and in the control system for various actions of the device so as to permit precise and stable actions.
  • Still another object of this invention is to provide various improved constituent elements which can, although not exclusively, be used conveniently in an automatic document conveying device including a document conveying means of a simplified structure annexed to the opening-closing frame.
  • a conveyor roller means is rotatably mounted on the opening-closing frame.
  • the conveying roller means is brought into intimate contact with the transparent plate disposed on the upper surface of the housing of the image processing machine.
  • the leading edge of a document delivered from the document table by the document delivery means abuts with the intimately contacting site between the conveyor roller means out of action and the transparent plate, and when the leading edge of the document is inclined in the widthwise direction, the inclination is corrected.
  • the conveyor roller means is rotated in the conveying direction and the document is conveyed to a required position on the transparent plate.
  • the rotation of the conveyor roller means in the conveying direction is stopped while the conveyed document is still nipped between the conveyor roller menas and the transparent plate.
  • a guiding means which permits advance of the document from the document table to the transparent plate, but hampers movement of the document from the transparent plate toward the document table and deflect it upwardly.
  • the guiding means is comprised of a flexible thin piece projecting downwardly inclinedly toward the downstream side as viewed in the document delivering direction, and a plurality of cuts are formed at intervals in the thin piece in the widthwise direction.
  • a discharge opening is formed in the opening-closing frame in relation to the conveyor roller means and the guiding means.
  • the conveyor roller means When the scanning of the document conveyed onto the transparent plate is over, the conveyor roller means is rotated in the reverse direction, and the scanned document is conveyed onto the opening-closing frame through the discharge opening while being deflected upwardly by the guiding means.
  • the rotation stop time of the conveyor roller means in the conveying direction is set according to the length of the document.
  • the opening-closing frame is mounted so that its mounting height can be adjusted freely by a mounting mechanism having an adjusting screw.
  • the opening or closing movement of the opening-closing frame is detected by a safety switch means whose detecting characteristics are maintained unchanged even when its mounting height is changed.
  • FIG. 1 shows an electrostatic copying machine shown generally at 2 and an automatic document conveying device shown generally at 4.
  • the electrostatic copying machine 2 of a known type is provided with a nearly parallelpipedal housing 6, and a transparent, usually rectangular, plate ( Figures 2 and 3) on which to place documents with its surface down is disposed centrally on the upper surface of the housing 6.
  • a paper cassette 10 holding a plurality of copying paper sheets is detachably mounted on one side of the housing 6, and a receiving tray 12 is mounted on the other side of the housing 6.
  • An operating panel 14 (which will be described further later on) having a plurality of operating switches and displayers are provided in one side portion of the front end of the upper surface of the housing 6.
  • a toner image is formed on the rotating drum by an image-­forming step including document scanning and exposure involving optically scanning the document placed on the transparent plate 8 ( Figures 2 and 3), and projecting a reflected image of the document onto the rotating drum.
  • the toner image is transferred to a copying paper sheet fed from the paper cassette, and the copying paper sheet having the toner image transferred and fixed is then discharged onto the receiving tray 12.
  • the illustrated automatic document conveying device 4 of the invention includes an opening-closing frame 16 and a stationary document table 18.
  • the opening-closing frame 16 is mounted pivotably between a closing position shown by a solid line in Figure 1 and an opening position shown partly in a simplified manner by a two-dot chain line in Figure 1 about a pivot axis 19 extending along the rear edge of the transparent plate 8, or more specifically in parallel to, and slightly rearwardly and upwardly of, the rear edge of the transparent plate 8 (the manner of mounting the opening-closing frame 16 will be described hereinafter).
  • the transparent plate 8 is covered with the opening-closing frame 16, and when it is held at the opening position, the transparent plate 8 is exposed to view.
  • the document table 18 is mounted on the housing 6 adjacent to one side (the left side as viewed from ahead) of the opening-closing frame 16.
  • a document delivery means 20 ( Figures 2 and 3) is annexed to the document table 18, and a conveyor roller means 22 ( Figures 2 and 3) is annexed to the opening-closing frame 16.
  • the document delivery means 20 delivers copying sheets on the document table 18 one by one toward the transparent plate 8.
  • the conveying roller means 22 introduces the delivered document into a required position on the transparent plate 8 and carries the scanned document from the transparent plate 8 to the upper surface of the opening-­closing frame 16.
  • the document table 18 may be made of a synthetic resin, and extends to the left from its downstream end which is in proximity to or in contact with the left side edge of the transparent plate 8.
  • the document table 18 is mounted on the housing 6 by fixing its downstream portion to the wall of the upper surface of the housing 6 by screwing or otherwise.
  • the document table 18 has an inclined downstream portion 24 extending from the aforesaid downstream end in an upwardly inclined manner toward the left, a short oppositely inclined portion 26 inclined in the opposite direction, namely in a downwardly inclined manner toward the left, and a main portion 28 extending from the oppositely inclined portion 26 in an upwardly inclined manner toward the left.
  • a greater part of the main portion 28 projects to the left beyond the housing 6 of the electrostatic copying machine 2.
  • a pair of width restricting members 30 are mounted on the main portion 28 of the document table 18.
  • the pair of width restricting members 30, which may be of a known type, are free to move toward and away from each other, and the distance between the two is set by hand at a length corresponding to the width of the copying paper sheet placed on the document table 18.
  • a front upstanding plate 32 and a rear upstanding plate 34 are disposed on both sides of the downstream portion of the document table 18. Between the front upstanding plate 32 and the rear upstanding plate 34 is disposed an upper guide plate 36 extending above the downstream portion of the document table 18.
  • an upper rotating shaft 42 and a lower rotating shaft 44 are rotatably mounted at a predetermined vertical interval between the front upstanding plate 32 and the rear upstanding plate 34.
  • Three feed rollers 46 are fixed at suitable intervals in the axial direction to the upper rotating shaft 42.
  • the feed rollers 46 which may be formed of a suitable material such as synthetic rubber projects downwardly through an opening formed in the upper guide plate 36.
  • the peripheral surfaces of the feed rollers are not completely circular, and a nearly crescent cut 48 is formed at a specific angular site of the feed rollers 46.
  • Four reverse-rotating rollers 50 are fixed at suitable intervals in the axial direction to the lower rotating shaft 44.
  • the reverse-rotating rollers 50 which may be formed of a suitable material such as synthetic rubber project upwardly through an opening formed in the inclined downstream portion 24 of the document table 18. It is seen from Figure 4 that the feed rollers 46 and the reverse-rotating rollers 50 are alternately arranged in the axial direction (i.e., the left-right direction in Figure 4), and each of the feed rollers 46 is disposed between the adjacent reverse­rotating rollers 50.
  • Base end portions of a pair of supporting arms 52 are pivotally mounted on the upper rotating shaft 42.
  • the pair of supporting arms 52 extend to the left in Figure 3, and a rotating shaft 54 is rotatably mounted across the free end portions of these supporting arms 52.
  • Two delivery rollers 56 are fixed to the rotating shaft 54 at a suitable interval in the axial direction.
  • the delivery rollers 56 may be formed of a suitable material such as synthetic rubber. Toothed pulleys 58 are also fixed to the upper rotating shaft 42 at positions adjacent to the base end portions of the pair of supporting arms 52.
  • toothed pulleys 60 are fixed also to both end portions of the rotating shaft 54, and a timing belt 62 is wrapped over each of the toothed pulleys 58 and each of the toothed pulleys 60. Accordingly, when the upper rotating shaft 42 is rotated counterclockwise in Figure 3 in the manner to be described (during which the lower rotating shaft 44 is rotated counterclockwise in Figure 3), the rotation of the upper rotating shaft 42 is transmitted to the rotating shaft 54 via the toothed pulleys 58, the timing belts 62 and the toothed pulleys 60, and the rotating shaft 54 is also rotated counterclockwise in Figure 3.
  • a cam shaft 64 is rotatably mounted between the front upstanding plate 32 and the rear upstanding plate 34.
  • a pair of cams 66 are fixed to the cam shaft 64 corresponding to the pair of supporting arms 52.
  • the cams 66 each have an actuating protrusion 68.
  • a flat restrained surface 70 is formed in the base end portions of the pair of supporting arms 52.
  • a set document detectory 72 and a delivered document detector 74 are disposed in relation to the downstream portion (the right end portion in Figure 3) of the document table 18.
  • the set document detector 72 is comprised of a switch having a detecting arm 73 which projects upwardly through an opening formed centrally in the width direction in the downstream end portion of the main portion 28 of the document table 18.
  • the delivered document detector 74 is also comprised of a switch having a detecting arm 75 which projects upwardly through an opening formed centrally in the width direction in the inclined downstream portion 24 of the document table 18.
  • a document restraining member 76 is further disposed in the illustrated document table 18.
  • the document restraining member 76 is mounted pivotally about a pin 78 extending in the width direction (the direction perpendicular to the sheet surface in Figure 3).
  • a tension spring 80 and an electromagnetic solenoid 82 are also provided in the document restraining member 76 disposed centrally in the width direction.
  • the tension spring 80 elastically biases the document restraining member 76 counterclockwise in Figure 3, and elastically maintain it at an operative position shown in Figure 3.
  • the free end portion projects upwardly through an opening formed in the downstream end of the oppositely inclined portion 26 of the document table 18.
  • the opening-closing frame 16 which can be formed of a suitable synthetic resin is generally box-like with an open bottom.
  • a main portion 86 of the opening-closing frame 16 is depressed, and its upper surface is slightly lower than the upper surfaces of a rear edge portion 88, a left side edge portion 90 and a right side edge portion 92.
  • an elongate discharge opening 96 extending in the width direction (the direction perpendicular to the sheet surface in Figure 3) is formed in a wall 94 extending downwardly from the right side edge of the upper surface of the left side edge portion 90 toward the upper surface of the main portion 86.
  • the width of the discharge opening 96 corresponds to the width of the document table 18.
  • the document is discharged onto the upper surface of the main portion 86 through the discharge opening 96, and hence, the upper surface of the main portion 86 constitutes a document receiving surface.
  • a plurality of slender protrusions 98 extending in the document conveying direction (the left-­right direction in Figure 3) are formed at suitable intervals in the width direction on the upper surface of the main portion 86.
  • a depression 100 which can be held by fingers when opening or closing the opening-closing frame 16 is disposed in the front surface of the opening-closing frame 16.
  • a pair of abutting protrusions 102 spaced from each other in the left-right direction in Figure 3 are formed in the lower end of the front surface of the opening closing frame 16, as shown in Figure 3.
  • the abutting protrusions 102 abut with the upper surface of the housing 6 of the electrostatic copying machine 2 whereby the closing position of the opening-closing frame 16 is regulated as is required.
  • a number of suspending columns 104 are formed integrally with the under surface of the main portion 86 of the opening closing frame 16, as shown in Figure 3, and a plate member 106 which may be rectangular is fixed to the lower ends of the suspending columns 104.
  • the plate member 106 When the opening-closing frame 16 is held at the closing position, the plate member 106 is positioned opposite to the transparent plate 8. In the left end portion of the plate member 106, a cut extending to the right by a predetermined length from the left end of the plate member 106 is formed corresponding to a roller, to be described later, in the conveyor roller means 22.
  • the plate member 106 may be formed of a suitable synthetic resin, and its under surface is white in color.
  • the sheet-like document to be copied is introduced between the transparent plate 8 and the plate member 106 to introduce the document stably without being hampered by the plate member 106, it is convenient to provide a clearance of about 1.0 mm between the transparent plate 8 and the plate member 106 when the opening-closing frame 16 is at the closing position.
  • the left end portion of the plate member 106 may be inclined slightly upwardly to the left.
  • a mounting mechanism shown generally at 108 may be utilized to mount the opening-closing frame 16.
  • the illustrated mounting mechanism 108 includes a mounting member 110 and a pivot member 114 pivotally linked to the mounting member 110 via a pin 112.
  • An insertion rod 116 extending downwardly from the under surface of the mounting member 110 is formed in the mounting member 110.
  • the mounting mechanism 108 comprised of the mounting member 110 having the insertion rod 116 formed therein and the pivot member 114 linked pivotally to the mounting member 110 via the pin 112 is known to those skilled in the art, and generally available commercially.
  • an adjusting screw 118 is secured to the under surface of the mounting member 110 so that the degree of its screwing can be adjusted.
  • the pivot member 114 of the mounting mechanism 108 is fixed to the inside surface of the rear edge portion 88 of the opening-closing frame 16 by a suitable method such as screwing.
  • an insertion hole 120 extending downwardly from the upper surface of the housing 6 is formed in the housing 6. The insertion rod 116 formed in the mounting member 110 is inserted into the insertion hole 120, and the head of the adjusting screw 118 is caused to abut with the upper surface of the housing 6.
  • the opening-closing frame 16 is mounted on the housing 6 so that it is free to pivot about the pin 112 of the mounting mechanism 108.
  • the central axis of the pin 112 constitutes the aforesaid pivot axis 19.
  • a clearance of about 1.0 mm should exist between the transparent plate 8 and the plate member 106 when the opening-closing frame 16 is held at the closed position.
  • the mounting height can be finely adjusted by properly controlling the degree of screwing of the adjusting screw 118 with respect to the mounting member 110. Specifically, the mounting height can be increased when the degree of screwing is decreased and the amount of protrusion of the adjusting screw 118 from the under surface of the mounting member 110 is increased. Conversely, when the degree of screwing is increased and the amount of protrusion of the adjusting screw 118 is decreased, the mounting height can be decreased. To adjust the mounting height in this manner, it is important that the insertion rod 114 formed in the mounting member 110 should be inserted into the insertion hole 120 formed in the housing 6 so as to be free to ascend and descend.
  • a check nut or the like may be combined with the adjusting screw 118 if required. Only one such mounting mechanism 108 may be used to mount the opening-closing frame 16, but desirably, two or more mounting mechanisms 108 are used at suitable intervals in the direction of the pivot axis 19.
  • a safety switch means 122 is disposed in the illustrated embodiment in order to detect the opening and closing of the opening-­closing frame 16.
  • the safety switch means 122 is comprised of a combination of a switch element 124 and an actuating piece 126.
  • the switch element 124 may be composed of a microswitch having a detecting arm 128, and is fixed to the inside surface of the rear edge portion 88 of the opening-closing frame 16.
  • the actuating piece 126 is fixed to the side surface of the mounting member 110 in the mounting mechanism 108. When the opening-closing frame 16 is at the closing position shown by the solid line, the free end of the actuating piece 126 acts on the detecting arm 128 of the switch element 124 to close the switch element 124.
  • the actuation piece 126 is fixed to the mounting member 110 of the mounting mechanism 108. Hence, when the mounting member 110 is elevated or lowered by varying the degree of screwing of the adjusting screw 118, the actuating piece 126 is accordingly elevated or lowered.
  • the positional relationship between the switch element 124 and the actuating piece 126 remains the same, and the detecting characteristics of the safety switch means 122 (namely, the angular position of the opening-closing frame 16 when the switch element 124 is open) remain the same.
  • the actuating piece 126 is fixed to the housing 6 instead of fixing it to the mounting member 110 of the mounting mechanism 108, changing of the mounting height of the opening-closing frame 16 by varying the degree of screwing of the adjusting screw 118 results in a change in the relative positions of the switch element 124 and the actuating piece 126, and the detecting characteristics of the safety switch means 122 change.
  • the detecting characteristics of the safety switch means 122 can be maintained the same even when as required, the switch element 124 is fixed to the pivot member 114 of the mounting mechanism 108 instead of the opening-closing frame 16, or the actuating piece 126 is fixed to the opening-closing frame 16 or the pivot member 114 and the switch element 124 is fixed to the mounting member 110.
  • Figure 6 shows a modified example of the safety switch means 122.
  • a depression 130 is formed in the upper surface of the housing 6, and a compression spring 132 together with the actuating piece 126 is received in the depression 130.
  • the compression spring 132 elastically biases the actuating piece 126 upwardly and causes one end of the actuating piece 126 to abut with the under surface of the mounting member 110.
  • the actuating piece 126 is accordingly elevated or lowered.
  • the mounting mechanism 108 and the safety switch means 122 described above with reference to Figures 5 and 6 can be applied especially conveniently to the opening-closing frame 16 of the automatic document conveying device 4. They can also be applied to an ordinary opening-closing frame which has no document conveying function but is useful for covering a document placed on the transparent plate.
  • the conveyor roller means 22 annexed to the opening-closing frame 16, as clearly shown in Figure 3, is disposed within the left side edge portion 90 of the opening-closing frame 16.
  • a front and a rear supporting wall 134 and 136 are formed integrally in the left side edge portion 90 of the opening-closing frame 16.
  • a rotating shaft 138 is rotatably mounted between the front and rear supporting walls 134 and 136. The rotating shaft 138 extends substantially perpendicularly to the pivot axis 19 of the opening-closing frame 16, and when the opening-closing frame 16 is held at the closing position, extends substantially horizontally on one side portion of the transparent plate 8.
  • a central roller 140 disposed centrally in the axial direction of the rotating shaft 138 and side rollers 142 and 144 disposed on both sides of the central roller 140 are mounted on the rotating shaft 138.
  • the central roller 140 has a relatively broad width, and is comprised of a base portion 146 fixed to the rotating shaft 138 and a surface layer 148 fixed to the peripheral surface of the base portion 146.
  • the base portion 146 may be formed of a suitable synthetic resin.
  • the surface layer 148 is preferably foamed of a flexible material such as a formed synthetic resin.
  • One preferred example of the foamed synthetic resin to make the surface layer 148 is foamed polyurethane sold under the tradename "EMO" by Inoue MTP Co., Ltd.
  • Base ends of cantilever supporting members 150 and 152 extending axially are fixed to both side surfaces of the base portion 146 of the central roller 140.
  • the cantilever supporting members 150 and 152 may be in a cylindrical form extending around, and concentrically with, the rotating shaft 138, and may be formed of a suitable synthetic resin.
  • the side rollers 142 and 144 are not directly fixed to the rotating shaft, but fixed to the free ends of the cantilever supporting members 150 and 152 and therefore supported by the cantilever supporting members 150 and 152.
  • the side rollers 142 and 144 are comprised respectively of cylindrical base portions 154 and 156 fixed to the free ends of the cantilever supporting members 150 and 152 and surface layers 158 and 160.
  • the base portions 154 and 156 may be formed of a suitable synthetic resin, and have an inside diameter much larger than the outside diameter of the rotating shaft 138, and a sufficient gap exists between them.
  • the surface layers 158 and 160 of the side rollers 142 and 144 are preferably formed of a flexible material such as a foamed synthetic resin as is the surface layer 148 of the central roller 140. It is important that the outside diameter d1 of the central roller 140 should be set such that when the opening-­closing frame 16 is at the closing position, the peripheral surface of the central roller 140 is brought into contact with the upper surface of the transparent plate 8.
  • the outside diameter d2 of the side rollers 142 and 144 is conveniently larger than the outside diameter d1 of the central roller 140 by about 1.0 to 2.0 mm.
  • the side rollers 142 and 144 are brought into intimate contact with the upper surface of the transparent plate 8 with the elastic deformation of their surface layers 158 and 160 and the elastic flexing of the cantilever supporting members 150 and 152.
  • a plurality of guiding ribs 162 are provided at suitable intervals in the width direction (the direction perpendicular to the sheet surface in Figure 3) in the left side edge portion 90 of the opening-closing frame 16 in relation to the conveyor roller means 22.
  • the lower edges of the guiding ribs 162 extends to the left and right nearly along the conveyor roller means 22.
  • a follow roller 166 is rotatably mounted on the guiding ribs 162 by a pin 164. The follower roller 166 projects downwardly beyond the lower edges of the guiding ribs 162, and makes contact with the central roller 140 in the conveyor roller means 22.
  • a guiding means 168 which permits the advancing of the document to the transparent plate 8 from the document table 18 but hampers the movement of the document toward the document table 18 from the transparent plate 8 and deflects it upwardly is disposed between the conveyor roller means 22 and the delivery end (i.e., the downstream end ) of the document table 18 positioned adjacent to it.
  • the guiding means 168 is comprised of a flexible thin piece 172 secured to the inside surface of the left wall of the opening-closing frame 16-via a slender supporting member 170.
  • the supporting member 170 extends in the width direction (the direction perpendicular to the sheet surface in Figure 8) and is fixed to the inside surface of the left side wall of the opening-closing frame 16.
  • the supporting member 170 may be formed of a suitable plate material such as a copper plate. Its lower end portion is inclined downwardly to the right and projects from the inside surface of the left side wall of the opening-­closing frame 16.
  • the thin piece 172 constituting the guiding means 168 is bonded at its upper end portion to the lower end portion of the supporting member 170, and is inclined downwardly to the right (and therefore inclined downwardly in the downstream direction as viewed in the direction of delivering from the document table 18).
  • the thin piece 172 may be conveniently formed from a suitable synthetic resin film, for example, a polyester film having a thickness of about 0.075 mm. If desired, the thin piece 172 may be formed of a suitable metallic foil. When the thin piece 172 is formed of a conductive metal foil, the thin piece 172 can be grounded and caused to function also as a charge eliminating means of removing an undesirable static charge from the document.
  • a plurality of recesses 176 are preferably formed in the thin piece 172 at suitable intervals in the width direction.
  • the width positions of the recesses 176 are preferably not in alignment with both side edges of the document of a specified size delivered from the document table 18 but deviated in the width direction with respect to the side edges.
  • the document table 18 is designed to deliver documents having width dimensions defined as B6, B5,A5 and A4 by JIS (Japanese Industrial Standards), and as shown in Figure 9, the recesses 176 formed in the thin piece 172 are deviated in the width direction with respect to the two side edges of documents having various sizes.
  • the recesses 176 facilitate the required flexing of the thin piece 172 by the action of the document delivered from the document table 18. It should also be noted that when a relatively narrow document having a size of, for example, B6 or A5 is delivered from the document table 18, its leading edge acts only on the central portion of the thin piece 172, and when the recesses 176 are absent, the thin piece 172 tends to be bent between its central portion and each side portion. If this bending occurs repeatedly and becomes incessant, a document delivered to the left in Figure 8 from the transparent plate 10 is likely to abut with the lower end of the thin piece 172 and jam up without being deflected upwardly along the thin piece 172.
  • both side portions of the thin piece 172 which exist outwardly of the outermost recess 176 are continued to be maintained in the initial state without bending during delivering of such a narrow document from the document table 18, as can be seen from Figure 9. Accordingly, the aforesaid bending can be avoided.
  • both corner portions of the document enter the recesses 176 when the document is delivered to the left in Figure 8 from the transparent plate 8 and raised along the thin piece 172. This is likely to result in document jamming.
  • Figure 10 shows a modified example of the guiding means.
  • the inclined surface 174 is formed in an additional portion annexed integrally to the downstream end of the document table 18 instead of forming the inclined surface 174 in the transparent plate 8 itself.
  • the lower end of the thin piece 172 is kept in contact with this inclined surface 174.
  • Figure 11 shows another modified example of the guiding means.
  • the upper end portion of the thin piece 172 is fixed to the outside surface of the cover 84 disposed in the downstream portion of the document table 18.
  • the thin piece 172 has an extension which extends further upwardly from its lower end kept in contact with the inclined surface 174.
  • a reversible electric motor 178 is disposed rearwardly of the rear upstanding plate 34 provided at the back of the downstream portion of the document table 18.
  • the reversible electric motor 178 constitutes a common driving source for the document delivery means 20 and the conveyor roller means 22.
  • a gear 182 is fixed to the output shaft 180 of the motor 178.
  • a linking means between the reversible motor 178 and the document delivery means 20 will be described.
  • the rear end portion of the lower rotating shaft 44 to which the reverse-rotating roller 50 is fixed projects rearwardly beyond the rear upstanding plate 34, and a gear 186 is mounted on this rear end portion of the lower rotating shaft 44 via a one-way clutch mechanism 184.
  • a short rod 188 projecting rearwardly is implanted in the rear upstanding plate 34, and an idle gear 190 is rotatably mounted on the short rod 188.
  • the idle gear 190 drivingly connects the gear 182 to the gear 186.
  • the front end portion of the upper rotating shaft 42 to which the feed roller 46 is fixed also projects forwardly beyond the front upstanding plate 32, and a gear 200 is mounted on this front end portion of the upper rotating shaft 42 via a solenoid-controlled spring clutch mechanism 198.
  • the spring clutch mechanism 198 is of the type in which one engagement protrusion 202 is formed on the outer circumferential surface of its boss.
  • the clutch mechanism 198 connects the gear 200 to the upper rotating shaft 42 through one rotation, namely until the control claw 206 returned to the original position by the deenergization of the solenoid 204 is again brought into engagement with the engagement protrusion 202.
  • a forwardly projecting short rod 208 is implanted in the front upstanding plate 32, and an idle gear 210 for drivig connecting the gear 196 to the gear 200 is rotatably mounted on the short rod 208.
  • Two short rods 228 and 230 are implanted in the supporting plate 222, and idle gears 232 and 234 are rotatably mounted on the short rods 228 and 230.
  • the idle gear 232 is kept in engagement with the idle gears 220 and 234.
  • a rearwardly projecting short rod 236 is implanted in the rear supporting wall 136 formed in the opening-closing frame 16, and an idle gear 238 is rotatably mounted on the short rod 236.
  • the idle gear 238 is brought into engagement with the idle gear 234.
  • the one-way clutch mechanism 240 transmits the rotation of the gear 244 to the rotating shaft 138 and rotates the shaft 138 in the direction shown by arrow 194 (clockwise in Figure 3).
  • the rotation of the gear 244 is not transmitted to the rotating shaft 138 via the one-­way clutch mechanism 240.
  • the above spring clutch mechanism 242 is of the type in which a number of engagement protrusions are formed on the outer circumferential surface of its boss.
  • the rotating shaft 138 of the conveyor roller means 22 has annexed thereto a detecting means 250 for detecting the amount of its rotation.
  • the detecting means 250 may be of a known form, and is comprised of a rotating plate 252 fixed to the rear end portion of the rotating shaft 138, and a photoelectric rotation detector 254 disposed in relation to the rotating plate 252.
  • a number of holes 256 are formed in the rotating plate 252 at equiangular intervals.
  • the detector 254 has a light emitting element 258 disposed on one side of the rotating plate 252 and a light receiving element 260 disposed on the other side of the rotating plate 252.
  • the rotating plate 252 rotates in the direction of arrow 192 or 194 and one hole 256 passes between the light emitting element 258 and the light receiving element 260, the light receiving element 260 receives light from the light emitting element 258 and produces a pulse.
  • the sheet-like documents 262 are stacked on the document table 18 with their surfaces down, and the forward edges of the document 262 are brought into contact with, or approximity to, the oppositely inclined portion 26 of the document table 18.
  • the document restraining member 76 held at the operative position hampers the forward movement of the documents 262 beyond the oppositely inclined portion 26.
  • a controller 264 provided in the automatic document conveying device 4 feeds a signal showing the presence of the documents 262 on the document table 18 to a controller 266 provided in the electrostatic copying machine 2.
  • the controllers 264 and 266 may each be constructed of a microprocessor.
  • a copy start switch button PS Figure 1
  • a signal indicating start of document delivery is fed to the controller 264 from the controller 266.
  • the controller 264 starts the reverse rotation of the reversible electric motor 178 (at the same time, the solenoid 246 of the clutch mechanism 242 is energized to avoid occurrence of the noises) prior to document delivery.
  • the conveyor roller 22 preliminarily begins to rotate clockwise in Figure 14-A.
  • the motor l78 is deenergized and stops its reverse rotation (the solenoid 246 of the spring clutch mechanism 242 is also deenergized).
  • the solenoid 246 of the spring clutch mechanism 242 is also deenergized.
  • the document is deflected upwardly by the guiding means 168, and discharged onto the document receiving surface (namely, the upper surface of the main portion 86 of the opening-closing frame 16) through the discharge opening 96 by the action of the conveyor roller means 22 and the follower roller 166 cooperating with it.
  • the predetermined time t0 ⁇ 1 may be set at a time interval required for discharging a document of the largest size that can be placed on the transparent plate 8.
  • a detector for detecting the delivered document above the guiding means 168, and to stop the preliminary rotation of the conveyor roller means 22 when the detector does not detect the document (and therefore, no document remains on the transparent plate 8) after a time period shorter than the above predetermined time t0 ⁇ 1 corresponding to the time required for the remaining document which has begun to be delivered by the action of the conveyor roller 22 to reach the detector) has elapsed from the time of starting the preliminary rotation of the conveyor roller 22.
  • the controller 264 stars normal rotation of the motor 178. Then, after a predetermined period of time t1 set by a timer T1 built in the controller 264 (for example, 150 ms) has passed, energization of a solenoid 82 is started. As a result, the document restraining member 76 is moved backward to its non-operative position shown in Figure 14-B from its operative position shown in Figure 14-A.
  • the solenoid 204 of the spring clutch mechanism 198 is energized instantaneously for a predetermined time t3 set by a timer T3 built in the controller 264.
  • the predetermined time t3 may be about 150 ms.
  • the cam shaft 64 to which the cams 66 are fixed is rotated counterclockwise in Figures 14-A and 14-B to lower the delivery roller 56 from its elevated position shown in Figure 14-A to its lowered position shown in Figure 14-B and brought into contact with the uppermost document 262 of the stack of documents 262.
  • the delivery roller 56 is rotated counterclockwise in Figure 14-B and the feed roller 46 and the reverse rotating roller 50 are rotated counterclockwise in Figure 14-B.
  • the uppermost document 262 on the document table 18 is delivered downstream (to the right in Figure 14-B), and the delivered document 262 is further fed downstream by the feed roller 46.
  • the reverse-rotating roller 50 prevents two or more documents 262 from being fed simultaneously.
  • the delivered document 262 closes the delivered document detector 74 and then its leading edge abuts with the intimately contacting site between the transparent plate 8 and the rollers 140, 142 and 144 of the conveyor roller means 22 which is still in a non-­operative state (out of operation).
  • the leading edge of the document 262 delivered from the document table 18 is inclined as viewed in the width direction, its inclination is remedied by the above abutment. Since as stated above the solenoid 204 is energized only instantaneously, the delivery roller 56 and the feed roller 46 stop after one rotation. In the meantime, the reverse-rotating roller 50 continues to rotate.
  • the cam shaft 64 stops after one rotation.
  • the delivery roller 56 is again returned to the elevated position.
  • the amount of feeding of the document 262 by one rotation of the feed roller 46 is set at a value slightly larger than the amount of feeding required to advance the leading edge of the document 262 to the aforesaid intimately contacting site between the transparent plate 8 and the rollers 140, 142 and 144. Accordingly, the inclination of the document 262 can be exactly corrected.
  • the trailing end of the document 262 still exists between the feed roller 46 and the reverse-rotating roller 50.
  • the feed roller 46 is at a stop at such an angular position that the cut 48 formed on its outer circumferential surface is directed downwardly, and does not act on the document 262. Hence, the above correction of the inclination of the document 262 is not obstructed by the feed roller 46 and the reversely rotating roller 50.
  • the solenoid 246 of the spring clutch mechanism 242 is energized.
  • the predetermined time t4 set by a timer T4 built in the controller 264 is set so that the solenoid 246 is energized after some delay from the time when the feed roller 46 is stopped after one turn.
  • the solenoid 246 is energized, the conveyor roller means 22 begins to be rotated counterclockwise in Figures 14-C and 14-D, and the document 262 begins to be introduced onto the transparent plate 8. As stated above, at this point of time, the rear portion of the document 262 still exists between the feed roller 46 and the reverse-rotating roller 50.
  • the feed roller 46 is at a stop at such an angular position that the cut 48 formed on its outer circumferential surface faces downwardly, and does not act on the document 262. Accordingly, the above introduction of the document 262 is not hampered by the feed roller 46 and the reverse rotating roller 50.
  • the trailing edge of the document 262 goes past the delivered document detector 74 and therefore the detector 74 is opened, as shown in Figure 14-D.
  • a counter C1 built in the controller 264 counts the number of pulses produced by the photoelectric rotating detector 254 from the time when the solenoid 246 is energized and the conveyor roller means 22 begins to be rotated clockwise in Figure 14-D to the time when the delivered document detector 74 is open and maintains this counted value n1 until the counter is reset in order to count the number of pulses again with respect to the next document.
  • the counted value n1 maintained by the counter C1 corresponds to the length of the document 262 introduced.
  • the counted value n1 is large when the document 262 is long, and is small when the document 262 is short.
  • Another counter C2 built in the controller 264 starts to count the number of pulses produced by the photoelectric rotation detector 254 from the time when the delivered document detector 74 is open.
  • n2 for example, 50
  • the supply of voltage for rotating the motor 178 in the normal direction is stopped.
  • voltage for rotating the motor 178 reversely is supplied only for a very short period of time t5 set by a timer T5 built in the controller 264.
  • the solenoid 246 is deenergized as soon as the reverse rotation of the motor 178 stops.
  • the supply of voltage to the motor 178 for reverse rotation for a short time t5 of, for example, about 27 ms applies a braking action on the motor 178 which has so far rotated in the normal direction to prevent idle running of the motor 178 by inertia and stop the normal rotation of the motor 178 precisely at the required point of time.
  • the introduction of the document 262 is over.
  • the predetermined counted value n2 defining the time of starting the reverse rotation of the motor 178 for the very short period t5 after stopping of its normal rotation is stored in a variable memory M1 built in the controller 266 of the electrostatic copying machine 2, and fed to the controller 264 of the automatic document conveying device 4 (this will be described further hereinafter).
  • the document 262 is delivered to the left in Figure 14-F from the transparent plate 8, deflected upwardly by the guiding means 168, and discharged onto the document receiving surface (the upper surface of the main portion 86 of the opening-­closing frame 16) through the discharge opening 96 by the action of the conveyor roller means 22 and the follower roller 166 cooperating with it.
  • the counter C3 built in the controller 264 begins to count pulses produced by the photoelectric rotation detector 254.
  • the counted value of the counter C3 reaches a value equalling the counted value n1 maintained by the counter C1 plus the predetermined value n3, the reverse rotation of the motor 178 is stopped.
  • the counted value n1 maintained by the counter C1 corresponds to the length of the introduced document 262 as stated above, and the predetermined value n3 is set at the smallest value required for document delivery.
  • the motor 178 is reversely rotated only for the minimum required period of time according to the length of the introduced document 262, and the wasteful consumption of power and time by the unnecessary reverse rotation of the motor 178 can be circumvented.
  • the introduced position of the document 262 which should be precisely set as described above depends upon the predetermined value n2 stored in the variable memory M1 built in the controller 266 of the electrostatic copying machine 2.
  • switches or keys disposed on the operating panel 14 of the electrostatic copying machine 2 are operated, for example, in the following manner.
  • a clear key CK and the copy start button PS are depressed simultaneously.
  • the controller 266 is in condition for accepting changes in the numerals set in the various memories.
  • a simulation number, for example "87” for changing the predetermined value n2 is selected so that the number "87” is displayed on a copy number displayer ND.
  • the code "d" of the predetermined number n2 and its memorized number, for example "50” are displayed on a copy magnification displayer MD.
  • copy magnification change keys MC1 and MC2 the number "50” is changed to the desired number and thus, the number memorized in the memory M1 is changed.
  • the clear key CK and the copy start button PS are then depressed simultaneously, the electrostatic copying machine 2 is returned to a normal state.
  • the above predetermined value n2 is stored in the memory M1 built in the controller 266 of the electrostatic copying machine 2 and fed into the controller 266 of the automatic document conveying device 4. Accordingly, without the need to provide switches and keys and displayers additionally for exclusive use, the predetermined value n2 can be changed easily by utilizing the switches and keys and displayers disposed on the operating panel 14 of the electrostatic copying machine 2. If the predetermined value n2 is stored in a memory of the controller 264 of the automatic document conveying device 4, various switches and keys and displayers must be provided additionally in the automatic document conveying device 4 in order to permit changing of the predetermined value n2. This leads to the increased cost of constructing the automatic document conveying device 4.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
EP89104530A 1988-03-15 1989-03-14 Dispositif d'alimentation automatique de documents Expired - Lifetime EP0333140B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP61333/88 1988-03-15
JP6133388A JPH0729703B2 (ja) 1988-03-15 1988-03-15 自動原稿搬送装置
JP63174135A JPH0755742B2 (ja) 1988-07-12 1988-07-12 原稿自動送り装置
JP174135/88 1988-07-12

Publications (2)

Publication Number Publication Date
EP0333140A1 true EP0333140A1 (fr) 1989-09-20
EP0333140B1 EP0333140B1 (fr) 1993-06-30

Family

ID=26402373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89104530A Expired - Lifetime EP0333140B1 (fr) 1988-03-15 1989-03-14 Dispositif d'alimentation automatique de documents

Country Status (4)

Country Link
US (1) US5058874A (fr)
EP (1) EP0333140B1 (fr)
KR (1) KR920008464B1 (fr)
DE (1) DE68907357T2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0479125A2 (fr) * 1990-09-29 1992-04-08 Mita Industrial Co. Ltd. Méthode et appareil pour le transport automatique de documents
EP0575884A1 (fr) * 1992-06-16 1993-12-29 Mita Industrial Co., Ltd. Appareil pour le transport automatique de documents
EP0584449A1 (fr) * 1992-08-25 1994-03-02 Kabushiki Kaisha Toshiba Appareil de formation d'images muni d'un appareil automatique d'alimentation en documents

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5367370A (en) * 1992-06-11 1994-11-22 Mita Industrial Co., Ltd. Mounting apparatus for a document-placing table on an image forming machine document feeder
JPH06199433A (ja) * 1992-12-28 1994-07-19 Canon Inc シート材自動給紙装置
KR100208140B1 (ko) * 1996-09-25 1999-07-15 윤종용 잉크-젯 프린터의 기록용지 자동 급지장치 및 그방법
KR100209506B1 (ko) * 1996-10-28 1999-07-15 윤종용 사무자동화기기에 있어서 용지급지대의 절환장치
KR100373752B1 (ko) * 2001-02-28 2003-02-26 삼성전자주식회사 화상정보처리기의 원고 이송장치
JP4665943B2 (ja) * 2007-06-13 2011-04-06 ブラザー工業株式会社 自動原稿給紙装置
JP6014398B2 (ja) * 2012-07-20 2016-10-25 キヤノン株式会社 画像読取装置

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DE3215538A1 (de) * 1981-04-27 1982-11-04 Canon K.K., Tokyo Papierzufuhr-steuereinrichtung
US4465272A (en) * 1981-03-31 1984-08-14 Mita Industrial Co., Ltd. Electrostatic copying apparatus
US4674735A (en) * 1983-12-07 1987-06-23 R. Clark DuBois Automatic sheet feeder for copiers and other machines having sheet transport mechanisms and assemblies therewith
US4707113A (en) * 1986-08-19 1987-11-17 Xerox Corporation Document feeder for moving platen copiers

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DE3201403A1 (de) * 1981-01-20 1982-08-12 Canon K.K., Tokyo Automatische vorlagenzufuehreinrichtung
US4565462A (en) * 1982-11-20 1986-01-21 Brother Kogyo Kabushiki Kaisha Paper loading apparatus for printer including plural feed paths
JPS60118551A (ja) * 1983-11-29 1985-06-26 Mita Ind Co Ltd 複写機の給紙装置
US4761001A (en) * 1984-07-10 1988-08-02 Canon Kabushiki Kaisha Automatic document feeder
US4632376A (en) * 1985-11-22 1986-12-30 Dubois R Clark Drive mechanism for document copier
JPS63201644A (ja) * 1987-02-17 1988-08-19 Sharp Corp 原稿自動搬送装置

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US4465272A (en) * 1981-03-31 1984-08-14 Mita Industrial Co., Ltd. Electrostatic copying apparatus
DE3215538A1 (de) * 1981-04-27 1982-11-04 Canon K.K., Tokyo Papierzufuhr-steuereinrichtung
US4674735A (en) * 1983-12-07 1987-06-23 R. Clark DuBois Automatic sheet feeder for copiers and other machines having sheet transport mechanisms and assemblies therewith
US4707113A (en) * 1986-08-19 1987-11-17 Xerox Corporation Document feeder for moving platen copiers

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0479125A2 (fr) * 1990-09-29 1992-04-08 Mita Industrial Co. Ltd. Méthode et appareil pour le transport automatique de documents
EP0479125A3 (en) * 1990-09-29 1992-09-02 Mita Industrial Co. Ltd. Automatic document conveying apparatus and method
US5184186A (en) * 1990-09-29 1993-02-02 Mita Industrial Co., Ltd. Motor control for an automatic document conveying apparatus
EP0575884A1 (fr) * 1992-06-16 1993-12-29 Mita Industrial Co., Ltd. Appareil pour le transport automatique de documents
US5412462A (en) * 1992-06-16 1995-05-02 Mita Industrial Co., Ltd. Automatic document conveying apparatus
EP0584449A1 (fr) * 1992-08-25 1994-03-02 Kabushiki Kaisha Toshiba Appareil de formation d'images muni d'un appareil automatique d'alimentation en documents
US5341203A (en) * 1992-08-25 1994-08-23 Kabushiki Kaisha Toshiba Image forming apparatus with an automatic document feeding apparatus during interrupt mode of operation

Also Published As

Publication number Publication date
DE68907357T2 (de) 1994-02-24
KR890015086A (ko) 1989-10-28
US5058874A (en) 1991-10-22
DE68907357D1 (de) 1993-08-05
EP0333140B1 (fr) 1993-06-30
KR920008464B1 (ko) 1992-09-30

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